Front tire size and RT

Glenn Quinn · 12-20-2011, 11:05 AM

I currently run a 24” X 4.5” X 15” front tire @ 33 psi. Since I will be replacing them this off season, I was wandering how a taller or smaller diameter tire will affect RT.

Glenn

Bill Baer · 12-20-2011, 10:34 PM

Taller tires have a little more roll out and will slow your reaction time smaller ones will do the inverse. I run a 5.00-5 on my S/C dragster they are .02-.04 quicker that the regular 17" dragster wheels/tires but you must stage very carefully with them.

Smallbloc · 01-22-2012, 11:58 AM

I've had many-.005 red lights with a 26'' tire

Should of had a 28'' tire!

Timetraveler · 01-26-2012, 07:07 PM

It all depends on your car and class. If your getting good RT with what you have been running then I would say stay with it.
I have a 66 Belair with a 383. For a full tree I use 30" but when I run a .500 pro tree I can't go red with them so I run a 26" and they work great.

RULER · 01-27-2012, 11:31 PM

What????????

Michael Beard · 02-01-2012, 04:22 PM

Unless you are blocking, you can find several hundredths difference in R/T on a Full Tree vs Pro Tree.

2" in tire size will get you roughly .015.

For more information join www.thisisbracketracing.com. There's an extensive 10+ pg editorial on bottom bulb reaction times and how to adjust them.

Timetraveler · 02-05-2012, 05:32 PM

I should have said that when I run a .500 pro tree I use a 26" tire. Sorry.

12-20-2011, 11:05 AM	#1
Glenn Quinn Junior Member Join Date: Nov 2007 Location: Conshohocken, PA Posts: 37 Likes: 0 Liked 0 Times in 0 Posts	Front tire size and RT I currently run a 24” X 4.5” X 15” front tire @ 33 psi. Since I will be replacing them this off season, I was wandering how a taller or smaller diameter tire will affect RT. Glenn

12-20-2011, 10:34 PM	#2
Bill Baer Senior Member Join Date: Jul 2007 Location: Nothern IL Posts: 596 Likes: 1 Liked 1 Time in 1 Post	Re: Front tire size and RT Taller tires have a little more roll out and will slow your reaction time smaller ones will do the inverse. I run a 5.00-5 on my S/C dragster they are .02-.04 quicker that the regular 17" dragster wheels/tires but you must stage very carefully with them. __________________ Bill Baer 3391 SC, 339B SC, QR

01-22-2012, 11:58 AM	#3
Smallbloc Junior Member Join Date: Dec 2010 Posts: 11 Likes: 0 Liked 0 Times in 0 Posts	Re: Front tire size and RT I've had many-.005 red lights with a 26'' tire Should of had a 28'' tire!

01-26-2012, 07:07 PM	#4
Timetraveler Member Join Date: Aug 2002 Location: Florida Posts: 103 Likes: 79 Liked 12 Times in 6 Posts	Re: Front tire size and RT It all depends on your car and class. If your getting good RT with what you have been running then I would say stay with it. I have a 66 Belair with a 383. For a full tree I use 30" but when I run a .500 pro tree I can't go red with them so I run a 26" and they work great. Last edited by Timetraveler; 02-06-2012 at 02:26 PM.

01-27-2012, 11:31 PM	#5
RULER Member Join Date: Jan 2006 Posts: 221 Likes: 15 Liked 58 Times in 18 Posts	Re: Front tire size and RT What????????

02-01-2012, 04:22 PM	#6
Michael Beard VIP Member Join Date: Sep 2002 Location: Columbus, OH Posts: 4,060 Likes: 0 Liked 13 Times in 9 Posts	Re: Front tire size and RT Unless you are blocking, you can find several hundredths difference in R/T on a Full Tree vs Pro Tree. 2" in tire size will get you roughly .015. For more information join www.thisisbracketracing.com. There's an extensive 10+ pg editorial on bottom bulb reaction times and how to adjust them. __________________ Michael Beard - NHRA/IHRA 3216 S/SS

02-05-2012, 05:32 PM	#7
Timetraveler Member Join Date: Aug 2002 Location: Florida Posts: 103 Likes: 79 Liked 12 Times in 6 Posts	Re: Front tire size and RT I should have said that when I run a .500 pro tree I use a 26" tire. Sorry.